Journal
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume 16, Issue 5, Pages 4350-4356Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2016.11017
Keywords
NH3 SCR; V2O5/TiO2; Promoter Effect; Sequential Impregnation
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Funding
- R&D Center for reduction of Non-CO2 Greenhouse gases - Korea Ministry of Environment (MOE) as Global Top Environment RD Program [0458-20140019]
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Recently, various promoters for commercial selective catalytic reduction (SCR) catalysts are used to improve DeNOx activity at low temperature. We aimed at finding the optimum condition to prepare V2O5/TiO2 catalyst by changing promoters (W, Ce, Zr and Mn), not only for improving SCR reactivity, but also for reducing N2O formation at high temperature. In addition, we changed the order of impregnation between promoter and vanadium precursors on TiO2 support and observed its effect on activity and N2O selectivity. We utilized various analytical techniques, such as N-2 adsorption-desorption, X-ray Diffraction (XRD), Raman spectroscopy, UV-visible Diffuse Reflectance Spectroscopy (UV-vis DRS) and Temperature Programmed Reduction with hydrogen (H2-TPR) to investigate the physicochemical properties of V2O5/TiO2 catalysts. It was found that W and Ce added V2O5/TiO2 catalysts showed the most active DeNOx properties at low temperature. Additionally, the difference in impregnation order affected the SCR activity. The superiority of low temperature activity of the vanadium firstly added catalysts (W or Ce/V/TiO2) is attributed to the formation of more polymerized V2O5 on the sample.
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